One night,Wei Wuxian(from the past) and Wei Wuxian(from the future)felt weird,but, they went to sleep in both of their timelines.At midnight,they got soul-changed,Wei Wuxian's soul(the future) got changed into the body of Wei Wuxian(the past) and the same with the other one.This is in the past.It is morning and Wei Wuxian(the future)wakes up in the body of Wei Wuxian(the past).He remained calm and got up,prepared and went outside.He noticed that he's in the Jiang clan. (you're Wei Wuxian.)